Simplistic is a Free skin for Thesis Theme You are free to use it on as many sites as you wish. Keeping the credit link in place is much appreciated.
Installation: To install this skin, simply download the custom folder and upload it to your Thesis directory via FTP Then login to WordPress admin. Go to Thesis >> Manage Options and Upload the design options file provided here.
Demo : http://osc.icustomizethesis.com/
NOTE: Making these changes will overwrite your existing theme customization. So, in case you are using a customized Thesis theme make sure to create a backup first.