One of our members did a pretty exhaustive online search and this is what she could find to date. If anyone knows of other patterns please do let us know. And if you make any of these, send us a picture! Thank you!
Glory Bee “Leap Year” cross-stitch (GB-01 – pattern only): http://www.glorybeestitch.com/fullveiws/gb-01.html I think it is out of print but you may be able to get a copy of it on eBay (which is where I got my copy) or this place might possibly still have it: http://www.thistleneedleworks.com/products/books/old37000.html
Prairie Schooler “A Farmer’s Almanac” cross-stitch (Book 144 – pattern only): http://www.prairieschooler.com/books/bk144.htm This one is more readily available and can be found in a variety of places online.
Anchor “It Must Be a Leap Year” (JR704 – kit): http://www.celticstitchery.com/CuteAnimals/JudyRossouw.htm This is an English company/design. Again I found it on eBay but you can buy it direct from the Celtic Stitchery link or on Amazon-UK: http://www.amazon.co.uk/ANCHOR-COUNTED-CROSS-STITCH-KIT/dp/B005EVPFTQ
This book purports to have a small cross-stitch design for every day of the year, including February 29th http://www.velona.com/items/024/B02435.html