There is a thread over at the "New to Gardening": forum right now about how to make a garden tunnel for kids. It's at http://forums.gardenweb.com/forums/load/newgard/msg0219313711792.html?6
'Hope this helps someone; It looks like a fun project. :)
Follow-Up Postings:
RE: Garden tunnel for kids (photos/instructions here)
HEY! now thats a great concept! I don't have kids as I'm still a teenager, but I'd love that for myself :) My cats would enjoy that as much as I would. It gets so hot down here my cats would have a "shady retreat" to lay down and watch the scenery.
RE: Garden tunnel for kids (photos/instructions here)