The only issue is that purchased temp powers are kind of hard-baked with their colors and such. The quickest route, IMO, would be to offer pre-built variants, like a blue hover disc, a red one, and so on, all as separate powers. Also, (and this may be a contentious topic), but such purchasable temp powers are not intended to be as intrinsic a component of your character as their primary, secondary, pools, and/or APP/PPP - they are external items, at least, that's my interpretation...