Spring and Toxic are really nice if you like a lot of green. I would probably go boreal force, spring relax and toxic blood since its the brightest
Mysterio and Gold go really well together, especially with the football helmet. I might pair it with pure or bronze for higher contrast or more variations in yellow.
Blue and Yellow always go well together, so that can be aqua/marine or neptune with sphinx, gold or static. all good stuff
Black and White are also really good together purely for the contrast.