I bought a case from
Uncommon, and I love love LOVE it so much I can't say enough. It has holes in all the right places, LOL (per Lena's note, above)... and it's fun to look at... and it's not bulky at all... and I've dropped my phone 2x now onto hardwood floors and/or concrete garage floors, and my phone is AOK (as is the case!). I recommend it highly. I even scrapped about it back in January on one of my Project Life pages... LOL...
ETA: I have the "capsule" version of the Uncommon case for the iPhone 4S
BONUS FOR YOU: if you end up wanting an Uncommon case, PM me and I have a 20% off code you can use. I'm not affiliated w/ the company in any way, it's just a code they sent me when I got my case (I was like, "hey, couldn't you have given that to ME to use?! gahhh!") and I haven't needed to use it, and probably won't ever. So... if you (or anyone else around these parts?) wants it... just let me know!