This is actually a tough challenge, because there are zillions of neat things on Etsy in this price range. I have chosen my gift for her, but I won't post it here because she's a reader. (Not that easily foiled, Beastmomma!)
While browsing Etsy.com, I came across something quite awesome (well beyond our $25 challenge) that I just have to show you...
It's a Wall Tentacle by ArtAKimbo from Redding, CT.
Link to the artist's blog: http://artakimbo.com/
Link to his shop on Etsy: http://www.etsy.com/shop/ArtAkimbo?ref=seller_info
Link to the Wall Tentacle: http://www.etsy.com/listing/56638710/wall-tentacle