There are some ideas in the galleries, but since they are down right now...you can see one of my power ranger cakes on my website. It's the fourth one in my What's New album. The cake on cc that I got the pattern from also had a full size power ranger guy in blue (rather than Mickey Mouse...I know, weird combo).
If it's a sheet cake, you could just do the oval mask really big with the cake "portrait" rather than 'landscape".
Hope you can get some sleep to get rid of the headache!