I'm not very familiar with CC3, but I believe it will work with.png files. Most of the art at Dundjinni is in png format, but a few are in .jpg. Just double check your downloads to be sure they are in png format. You stated that you downloaded everything marked Fantasy, but as there are over 50 thousand items in the Objects & Textures (Fantasy) Thread, I suspect you missed a few. Here in the Guild I have a thread in which I have posted a couple hundred objects and textures that you should be able to use, and there are many others that have as well.

Click here for my Mapping Elements Thread: http://www.cartographersguild.com/sh...les-and-Chairs