Its easy to customize your LoriTweets.
LoriTweet uses the colors that you have already chosen for your Twitter profile. To change the style of your LoriTweets just edit your Twitter profile colors here
Then go to "Change design colors" at the bottom of the Design page.
LoriTweet uses the "text" color for your text and the "sidebar" color for your background, whatever colors you choose on Twitter will show up in your LoiTweet feed.
You can also change your Twitter profile colors using Themeleon from COLOURLovers to help pick your favorite design.