Sew4Fun & Tlrnhi,
I looked for the slice of cake pattern but I couldn't find the one I originally saw that looked closer to what is pictured here. S.D., yours is much prettier than the one I found. I guess I should have bookmarked it, oh well next time. When I get a chance I'll continue to look for it or maybe I'll come across it by chance. The one that I did find is a thinner slice but I'm sure that you can make it whatever size you want once you get the basic pattern and instructions. Happy sewing and I hope that this link is of some help.
www.crafster.org