Fix gallery example and only use CC images

I've used the following three:
- http://www.flickr.com/photos/livenature/175872009/sizes/l/in/photostream/
- http://www.flickr.com/photos/salim/402623151/sizes/l/in/photolist-BzxQt-Bzyfk-BzyVr-BzAdb-BzBFY-BzC1a-BzCiV-BzCY6-BzDN8-BzE5z-Ezwhk-JGHQY-JGSCk-4qAtB4-4KySHh-4LEesX-5msbtv-5o5GY7-5x1ykE-5x1BH7-5R11B1-6fhV4W-6nzLHP-6u7c4x-6Az4Kt-6AL9bA-75HwLk-75Hx5g-gxzCVN-dSFuxm-8bUn4o-8bR37M-8bUjyy-8bR2Dp-8bUkAo-8bUkfJ-8bR3mi-8bUjr1-8bUk7L-7Ddebk-adLv3b-8Sbqri-fFYWRC-bEuSSo-8roKHp-8bUjQ5-92GxXg-fFZM2G-adLjsm-fFGNFp-7FnkyK/
- http://www.flickr.com/photos/idleformat/5637667104/sizes/l/in/photolist-9Abw1Y-9A8wEz-9AbwLw-9AbrF7-7NNLyT-9AbqhQ-9Abrm5-9AbqZC-9AbsSN-9Abqty-9A8sAV-dzopQ7-bWBDbg-dq73EE-dq6T3M-7Kvg4X-dq6UgH-apG6Zi-7TKJhZ-bhPwFz-9NXgEW-agCDBG-bCWQre-bq2YN9-gmAbXh-9A8xhD-7NNDZx-ffBnzM-bdYoFr-9cAgUU-c29nv5-9rWi5f-a5KqE9-djaFFT-a3nC6D-8Yc3st-bWrToT-bWrXTZ-bWrZ1z-adLhA1-8HxMxa-ewj9wL-9GYpau/

As far as I can tell, those should be alright to use.