In fact, I have put the lemon together for you, yes:-) and very fast. You can create your own bump and function files in 512x512 grey scale. MAke it semless and you can get every thing you want. In playing around with existing filters or in creating bew filters (click on a filter and choose EDIT), there are infinite possibilities. But you're right, it needs time. To create "dark round spots" combined with a bump is also possible. The dark round spots are done with a color mixture function. If I knew exactly what you're looking for, I could try out. Needs a sample image... Guitta