There are a lot of skins available at XDA Developers for Resco’s File Manager alternative, Resco Explorer, which will help you het the most out of it in an eye candy way. Additionally, you can find some themes in this thread too.

For installation and usage, download and unzip the skn file to DEVICEProgram FilesResco explorerskin (or wherever you have it installed just put it in the skin folder), run Resco Explorer, go to > Options > Customize > Skin and select the skin of your liking.