Blaze and Sonic: Green Hill

EDIT: Finally finished the background!
I know it's not much, but it actually is the most detailed background I've ever made so far and I'll never be good at them if I don't try
Anyway, hope you like it
(If anyone misses the old version without background let me know and I'll post it again)

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Didn't upload much last month due to working on a bigger project than usual, hope you like the result
(That poor killer-robot doesn't stand a chance against that destructive little kitty and hedgie )

Considering to make a background, so it might not really be finished yet  
I'm having difficulties deciding what background theme I should do What do you guys think? Green Hill, Mushroom Hill, Sky Sanctuary, or something else?