These are a few tiles I've been working off and on with for a while now, you may have seem a bit of them before, but I figured I should make a serious go at a thread about them, since I work on them quite often.
Hopefully I'll have sprites, animations and the whole mock-up-works here for you to crit etc.
->Everything is WIP and subject to lots of changes.

1 2
3 4

#1 is where I started off, I wanted it to be the bouncy happy field/hilly area where main chars always seem to start off and kill the easiest bad guys.. However I think I will focus on making it more of a jungle of hilly thorn-area. or be able to work for all three depending on the badguys and BGs.
#2 is kind of your basic rock and grass area, and so I think it'll be the starter zone. Ive noticed that it doesn't really have to same kind of layout as the other tilesets, so I have to correct that, also going to make it more shadowy at the bottom. The anims are tests, but as you can see with the snow level i might have the little cabin guy live in every area and sell you weapons, or juts say 'hey!' all the time.
#3 snow level. pretty straight forward, its the newest eddition, so more BG obects etc to come. also experimenting with a BG scene for it.
#4 was originally meant to be background extras for tileset #1 only, but now I'm not sure, I'll use it somewhere.. I might animate the little heart-shaped fruits to sway in the breeze a little.

-having trouble making  backgrounds, I'll post my wips soon.

-level samples to come. for now see and older version with some sprites
http://www.pixeljoint.com/pixelart/41605.htm#c247581

To be honest, I had to look very hard to find any crits 
The only flaw I see is the cabin walls look a bit flat; the front wall should be lighter than the one to the left.

yes the "top" ones are goodk its the ones that are below that