LONESOME PRAIRIE Well, turning 50 may not be the end of the trail, but it may seem like it!  Surprise your cowboy friend with an "over-the-hill" (or under it) theme!   Boots, a flower, and a headstone - what more could anyone want?  The design features multiple cactus and flower trim.        Iced with butter cream, the top edge is trimmed in a rope pattern.  All items are edible except the boots (of course)