[Windows Phone 7 Development and Hacking] Tuska:
More findings:

Edit file C:\Program Files\MSBuild\Microsoft\Silverlight for Phone\v4.0\YamanoteManifestSchema.xsd

<xs:element name="Tokens" type="CT_ThirdPartyAppTokens"/>

and change it to

<xs:element name="Tokens" type="CT_Tokens"/>

After this you can use all 10 different token templates:

<xs:complexType name="CT_TokenTemplate1">

<xs:sequence>

<xs:element name= "Number" type= "ST_ResourceID"/>

<xs:element name= "IconImageURI" type="CT_ResourcePath"/>

<xs:element name= "Title" type= "ST_ResourceID"/>

<xs:element name= "Message" type= "ST_ResourceID"/>

</xs:sequence>

</xs:complexType>

<xs:complexType name="CT_TokenTemplate2">

<xs:sequence>

<xs:element name= "BackgroundImageURI" type="CT_ResourcePath" minOccurs="0"/>

<xs:element name= "IconImageURI" type="CT_ResourcePath" minOccurs="0"/>

<xs:element name= "Title" type= "ST_ResourceID" minOccurs="0"/>

</xs:sequence>

</xs:complexType>

<xs:complexType name="CT_TokenTemplate3">

<xs:sequence>

<xs:element name= "Title" type="ST_ResourceID"/>

<xs:element name= "ImageURI" type= "CT_ResourcePath"/>

<xs:element name= "BackgroundImageURI" type="CT_ResourcePath"/>

<xs:element name= "AvatarImageURI" type= "CT_ResourcePath"/>

<xs:element name= "Count" type= "ST_ResourceID"/>

</xs:sequence>

</xs:complexType>

<xs:complexType name="CT_TokenTemplate4">

<xs:sequence>

<xs:element name= "DayNumber" type= "ST_ResourceID"/>

<xs:element name= "DayName" type= "ST_ResourceID"/>

<xs:element name= "AppointmentTitle" type= "ST_ResourceID"/>

<xs:element name= "AppointmentDescription" type= "ST_ResourceID"/>

<xs:element name= "AppointmentLocation" type= "ST_ResourceID"/>

<xs:element name= "ConflictIndicator" type= "ST_ResourceID"/>

<xs:element name= "Time" type= "ST_ResourceID"/>

</xs:sequence>

</xs:complexType>

<xs:complexType name="CT_TokenTemplate5">

<xs:sequence>

<xs:element name= "BackgroundImageURI" type="CT_ResourcePath"/>

<xs:element name= "Count" type= "ST_ResourceID"/>

<xs:element name= "Title" type= "ST_ResourceID"/>

</xs:sequence>

</xs:complexType>

<xs:complexType name="CT_TokenTemplate6">

<xs:sequence>

<xs:element name= "BackgroundImageURI" type="CT_ResourcePath"/>

<xs:element name= "Count" type="ST_ResourceID"/>

<xs:element name= "Title" type="ST_ResourceID"/>

</xs:sequence>

</xs:complexType>

<xs:complexType name="CT_TokenTemplate7">

<xs:sequence>

<xs:element name= "BackgroundImageURI" type="CT_ResourcePath"/>

<xs:element name= "IconImageURI" type="CT_ResourcePath"/>

<xs:element name= "Title" type="ST_ResourceID"/>

<xs:element name= "ImageURI" type="CT_ResourcePath"/>

</xs:sequence>

</xs:complexType>

<xs:complexType name="CT_TokenTemplate8">

<xs:sequence>

<xs:element name= "BackgroundImageURI" type="CT_ResourcePath"/>

<xs:element name= "Title" type="ST_ResourceID"/>

<xs:element name= "Subtitle" type= "ST_ResourceID"/>

</xs:sequence>

</xs:complexType>

<xs:complexType name="CT_TokenTemplate9">

<xs:sequence>

<xs:element name= "BackgroundImageURI" type= "CT_ResourcePath"/>

<xs:element name= "Title" type="ST_ResourceID"/>

<xs:element name= "Subtitle" type="ST_ResourceID"/>

</xs:sequence>

</xs:complexType>

<xs:complexType name="CT_TokenTemplate10">

<xs:sequence>

<xs:element name= "Title" type= "ST_ResourceID"/>

<xs:element name="Photo01ImageURI" type="CT_ResourcePath"/>

<xs:element name="Photo02ImageURI" type="CT_ResourcePath"/>

<xs:element name="Photo03ImageURI" type="CT_ResourcePath"/>

<xs:element name="Photo04ImageURI" type="CT_ResourcePath"/>

<xs:element name="Photo05ImageURI" type="CT_ResourcePath"/>

<xs:element name="Photo06ImageURI" type="CT_ResourcePath"/>

<xs:element name="Photo07ImageURI" type="CT_ResourcePath"/>

<xs:element name="Photo08ImageURI" type="CT_ResourcePath"/>

<xs:element name="Photo09ImageURI" type="CT_ResourcePath"/>

<xs:element name="Photo10ImageURI" type="CT_ResourcePath"/>

<xs:element name="Photo11ImageURI" type="CT_ResourcePath"/>

<xs:element name="Photo12ImageURI" type="CT_ResourcePath"/>

<xs:element name="Photo13ImageURI" type="CT_ResourcePath"/>

<xs:element name="Photo14ImageURI" type="CT_ResourcePath"/>

<xs:element name="Photo15ImageURI" type="CT_ResourcePath"/>

<xs:element name="Photo16ImageURI" type="CT_ResourcePath"/>

<xs:element name="Photo17ImageURI" type="CT_ResourcePath"/>

<xs:element name="Photo18ImageURI" type="CT_ResourcePath"/>

</xs:sequence>

</xs:complexType>

<xs:complexType name="CT_TokenTemplate11">

<xs:sequence>

<xs:element name= "Title" type= "ST_ResourceID"/>

<xs:element name= "ContactPhotoImageURI" type= "CT_ResourcePath"/>

<xs:element name= "Message" type= "ST_ResourceID"/>

<xs:element name= "MessagePhotoImageURI" type= "CT_ResourcePath"/>

</xs:sequence>

</xs:complexType>

Some of the templates are actually quite nice looking!

And if you don't want to edit build-files, then just patch WMAppManifest.xml directly and put it back to the xap file and deploy.

Oh, and you can reference to resources directly inside phone:

<IconImageURI>res://StartMenu!TokenIE.png</IconImageURI>

<IconPath xmlns="">res://StartMenu!AppIconCalendar.png</IconPath>

<IconImageURI>res://ASIcons!token.genericmail.png</IconImageURI>

or to use in the smaller menu:

<IconPath IsResource="true" IsRelative="false" >res://ASIcons!token.genericmail.png</IconPath>