What is the best app for WP8 for making custom tiles, like splitting up pictures into tiles etc. There are ones in the store but need to be naught for some effects.
Also try out the skinnery app which is pretty decent also there is a big push to get more apps to have skinnery support (live tiles) currently as far as I seen games gone free and ilol'd support it. There maybe others but these are only two apps from the apps i use that have implemented support.
I use Skinery Themes, which is currently in beta, but offers a similar experience to Skinery Tiles and Custom Tile Maker. Here is the link:
Skinery Themes | Windows Phone Apps+Games Store (United States)