Ribbon theme is good designed theme with few customization options, like background and twitter. You should try this one, for personal and for business blogs. I would like to see color customization for this gray-red parts and links, and better background customization options. Overall is really really good one. Check it out.
theme is made by http://wakecodesleep.com/
I love this one, is just awesome. And, i know, i know, is premium… but just 9$! That is not much is you want to make something good that will stay there for some preiod of time. If you change themes like you change your clothes, this one is not for you. ;) . This theme have a bunch of customization options. Check it out.
Author of this theme http://tumble.sneak.co.nz/
This one is perfect for photobloging if you ask me, and it have few nice customization options. And not just for photobloging, but all sides tumblr content. You gotta try it. Check it out here.
AOut of this theme is http://new.samstefan.co.uk/
And this dude with sunglasses on this picture is me! Ivalex :)
Chunk is nice clean theme, it will suit everyone who wants something clean. I was a bit amazed with this theme because it does not have any theme customization. So, basically, what you see is what you get. If you know some html, this could be different story… I think that it deserves to be on this list because it offers something unique and is good designed. Check it out.
Author of this heme is http://thecityloop.tumblr.com/