[One (M9) Themes and Apps] old.splatterhand:
Maybe i have a solution for you guys, at least for the rooted phones.

I had the same problem on my M8 with Sense 7 Software and Theme Maker Pro.

The pink color seems to appear with a black/dark theme.

I'm using Insert Coin, which has some additional black accent colors.

I made some investigations and i found out, how to change them to the color i want, the htc green from Sense 6.

Ok, if you can edit system files on your phone (root), go to \system\customize\ACC (path/file may vary with carrier phones) and open default.xml with a text editor.

Add the red highlighted part and don't forget to save.

I marked the color code of the accent color which i changed to green.

<app name="ThemeSelector">
<item type="string-array" name="cmf_theme_color">
<string>cc=GOD00:wp=wallpapers_07.jpg:c1=#857663:c2=#73a1ae:c3=#8c7f6f:c4=#46413d:c1k=#4c4439:c2k=#405361:c3k=#403b35:c4k=#292522:c1l=#f4bd56:c2l=#96f2ef:c3l=#ffb661:c4l=#ffb661:d1=#857663:d2=#73a1ae:d3=#8c7f6f:d4=#46413d</string>
</item>
<item type="string-array" name="default_theme_color">
<string>id=com.htc.theme.tcceac82e-953e-43df-bdac-cbb094435004:title=Pastorale:c1=#334932:c2=#f16125:c3=#637a46:c4=#00b79f:c1k=#1e402b:c2k=#b4481b:c3k=#4d6136:c4k=#028b78:c1l=#d8b827:c2l=#b4481b:c3l=#f16125:c4l=#d8b827:d1=#334932:d2=#f16125:d3=#637a46:d4=#00b79f</string>
<string>id=com.htc.theme.t1e4578e0-0df4-4c4f-8941-4df7511459fd:title=Numéro:c1=#7fd3c4:c2=#f68b9f:c3=#bdbcb9:c4=#a4a4a1:c1k=#72bdb0:c2k=#c86579:c3k=#b2b0ae:c4k=#959492:c1l=#f68b9f:c2l=#7fd3c4:c3l=#7fd3c4:c4l=#7fd3c4:d1=#7fd3c4:d2=#f68b9f:d3=#bdbcb9:d4=#a4a4a1</string>
<string>id=com.htc.theme.tc5962215-448b-47ad-8428-dab9ce38e070:title=Innerspace:c1=#58c9a5:c2=#29c7d3:c3=#5d3d7f:c4=#f8bd1f:c1k=#2d9476:c2k=#24949e:c3k=#452b61:c4k=#bb911e:c1l=#71ffd2:c2l=#252e42:c3l=#d9e021:c4l=#29c7d3:d1=#58c9a5:d2=#29c7d3:d3=#5d3d7f:d4=#f8bd1f</string>
<string>id=com.htc.theme.ta02d84bb-bff9-4d74-8c5c-396e29c27067:title=Traction:c1=#f44336:c2=#f44336:c3=#f44336:c4=#f44336:c1k=#411310:c2k=#411310:c3k=#411310:c4k=#411310:c1l=#ff5e52:c2l=#ff5e52:c3l=#ff5e52:c4l=#ff5e52:d1=#f44336:d2=#411310:d3=#9c2820:d4=#ff5e52</string>
<string>id=com.htc.theme.t4958e5c8-4a86-4d2f-8ad7-a491a790b18d:title=Tilt:c1=#1f1e20:c2=#1f1e20:c3=#1f1e20:c4=#1f1e20:c1k=#0c0c0d:c2k=#0c0c0d:c3k=#0c0c0d:c4k=#0c0c0d:c1l=#188df2:c2l=#188df2:c3l=#188df2:c4l=#188df2:d1=#0c0c0d:d2=#1f1e20:d3=#404040:d4=#188df2</string>
<string>id=com.htc.theme.td77bd697-2811-482e-961f-e65cbdffdf65:title=Nimbus:c1=#a6744b:c2=#a6744b:c3=#a6744b:c4=#a6744b:c1k=#4d3522:c2k=#4d3522:c3k=#4d3522:c4k=#4d3522:c1l=#ffb273:c2l=#ffb273:c3l=#ffb273:c4l=#ffb273:d1=#a6744b:d2=#4d3522:d3=#8f6542:d4=#ffb273</string>
<string>id=com.htc.theme.tb930c680-2eae-47da-909f-992e4f061056:title=Origami:c1=#0096b6:c2=#3bd8b9:c3=#d2916e:c4=#f55732:c1k=#006a81:c2k=#44967c:c3k=#a66342:c4k=#bb5841:c1l=#f55732:c2l=#f55732:c3l=#3bd8b9:c4l=#0096b6:d1=#0096b6:d2=#3bd8b9:d3=#d2916e:d4=#f55732</string>
<string>id=com.htc.theme.t51edf118-cfb9-465d-b1e4-d650534b8e9c:title=Cascadia:c1=#273e81:c2=#20a9ff:c3=#4e3fdf:c4=#7f2085:c1k=#101936:c2k=#146699:c3k=#2a2278:c4k=#49124d:c1l=#4d79ff:c2l=#fff776:c3l=#41dce8:c4l=#f665ff:d1=#273e81:d2=#20a9ff:d3=#4e3fdf:d4=#7f2085</string>
[COLOR="Red"]<string>id=com.htc.theme.tb930c680-2eae-47da-909f-992e4f061012:title=Black:c1=#000000:c2=#000000:c3=#000000:c4=#000000:c1k=#000000:c2k=#000000:c3k=#000000:c4k=#000000:c1l=#a1a1a1:c2l=#a1a1a1:c3l=#a1a1a1:c4l=#a1a1a1:d1=#000000:d2=#000000:d3=#a1a1a1:d4=#000000</string>
<string>id=com.htc.theme.tf803b3df-66cb-4e8a-a579-19b0513dsd10:title=Black 1:c1=#000000:c2=#000000:c3=#000000:c4=#000000:c1k=#000000:c2k=#000000:c3k=#000000:c4k=#000000:c1l=#4472f5:c2l=#4472f5:c3l=#4472f5:c4l=#4472f5:d1=#000000:d2=#000000:d3=#4472f5:d4=#000000</string>
<string>id=com.htc.theme.tf803b3df-66cb-4e8a-a579-19b0513efg10:title=Black 2:c1=#000000:c2=#000000:c3=#000000:c4=#000000:c1k=#000000:c2k=#000000:c3k=#000000:c4k=#000000:c1l=#[COLOR="SeaGreen"]4EA670[/COLOR]:c2l=#[COLOR="SeaGreen"]4EA670[/COLOR]:c3l=#[COLOR="SeaGreen"]4EA670[/COLOR]:c4l=#[COLOR="SeaGreen"]4EA670[/COLOR]:d1=#000000:d2=#000000:d3=#[COLOR="SeaGreen"]4EA670[/COLOR]:d4=#000000</string>
<string>id=com.htc.theme.tf803b3df-66cb-4e8a-a579-19b0513esa10:title=Black 3:c1=#000000:c2=#000000:c3=#000000:c4=#000000:c1k=#000000:c2k=#000000:c3k=#000000:c4k=#000000:c1l=#ef0410:c2l=#ef0410:c3l=#ef0410:c4l=#ef0410:d1=#000000:d2=#000000:d3=#ef0410:d4=#000000</string>
<string>id=com.htc.theme.tf803b3df-66cb-4e8a-a579-19b0513eva10:title=Grey 3:c1=#17212A:c2=#17212A:c3=#17212A:c4=#17212A:c1k=#17212A:c2k=#17212A:c3k=#ef0410:c4k=#17212A:c1l=#ef0410:c2l=#ef0410:c3l=#ef0410:c4l=#ef0410:d1=#17212A:d2=#17212A:d3=#ef0410:d4=#17212A</string>[/COLOR]
</item>
</app>

I'm not sure, if this can/will work on M9 and its software, but maybe worth a try.

Thanks [MENTION=4904866]ineedone[/MENTION] for making this possible!