I want to make horse hoofprints and cart tracks, in mud or dirt, as well as horse apples. I have a feeling a Photoshop brush and using layer styles may get the desired results, but I'm not really sure how to go about this (I suppose horse apples could be constructed from scratch, but that might be a bit complicated). Are there any brushes like this? Or how would I go about making the images to use? And what sort of layer styles - bevel and emboss comes to mind.

Thanks.