Botanical Print Size options from Cafe Press

Imagekind Print Container Sizes

Size	Max Size in Inches	Min Pixel Dimensions
Petite	8x10	800 pixels
Small	11x16	1100 pixels
Medium	16x24	2400 pixels
Large	24x32	3200 pixels
Grande	36x48	3600 pixels
Massive	44x60	6000 pixels

Source:  http://www.imagekind.com/printing.aspx