I myself use this browser all the time. it uses IE but like MYIE and the others it adds tabbed browsing, autologin (favorite feature) and grouping of sites.( a one click step to opening up a bunch of pages at once.)

http://bitterapple.mine.nu/lh4074SBskin.rar
after waiting for months for a site with slimbrowser skins to come.. none ever did, i decided to take action.
hope you alll like it. its not completelly done since i do have to fix up the toolbar buttons, min,max and close buttons and the spaceness of the titlebar... but its a nice change.
just extract the contents into the C:\Program Files\SlimBrowser folder.. it will ask if you want to replace the 2 files, click yes. or you can just drag the SKINS folder into the same directory to just add the skin. (you wont have to replace files.
feedback (bad/good) requested.