I went with a G1 color scheme despite being a tank (G2). And Skullgrin was PERFECT for that. He even has red on the back/insides of his lower legs!

Robot mode

Vehicle mode
You can see full details about his making and more pics at my blog...
http://www.hougesandwich.blogspot.com/2012/09/ok-so-for-this-one-i-decided-to-remake.html
for Megatron
http://www.hougesandwich.blogspot.com/2012/09/so-skullgrin-figure-that-i-used-for.html
for Megatron and his arm canon