One of our favorite DIY projects ever was this giant cactus body pillow Sheca made for Leah some years back (we eventually sold it and now she's wishing we hadn't) -- I think I'll make another one soon.
Here's a list of materials used:
Green velvet fabric (I used 2 1/2 yds)
Green yarn (I used a wool blend)
I cut the body and standard pillows opened to use the stuffing from them when making the cactus.
Draw a pattern using scrap fabric ior paper before you trace onto your actual velvet.
You could sew this by hand but I used a machine to make the pillow.
A good tutorial on making a cactus pillow can be found here.
We're obsessed with the results!