I'll be posting Manifestation CCS' free monthly GIMP card game design templates here as they are released throughout the year. Feel free to download the templates at the download links provided in the following replies. We hope these help everyone with their prototyping and play-testing needs. More info at: http://www.manifestationccs.com/prototypes/
Also, if you'd like to make visual theme suggestions for upcoming card templates, go to Manifestation CCS' CONTACT page (http://manifestationccs.com/contact/) and use the focus: "Monthly Prototype Suggestions."
More to come!