Creative Commons labeled designs are free to use as a basis for your own work. It does not allow you to claim my work as your own. A simplified summary of the license can be found here and it will like you to the full use requirements. I will be using Creative Commons Attribution 4.0 as my license which means you must provide credit and note of any changes. Attribution should be “Allison Cox, www.sansredraft.com”. You may place this in comments, in an dedicated attribution page or in another manner where credit is given but out of the way (since these are art assets).
iOrnament is an app for iDevices that is a great aid in making tiled patterns with various kinds of symmetry. These are released with permission to do so from the creator. Please see their site here for more information on the apps they have made and the math behind them. If you would like to give additional attribution to the iOrnament creator "Jürgen Richter-Gebert, science-to-touch.com" would likely work or you can message them through their site to ask.