"Memories of Lothlorien" by Stephanie Pui-Mun Law at www.shadowscapes.com/
Tam Lin- I like this version of their meeting. (It's a lot less violent than "he asked no leave of her as she lay on the ground," for a start.)
Tam Lin- although he doesn't usually turn into a snake, a lion and a ... plaid thing? all at the *same* time.