Elton John Auction Includes Costumes and Birthday Collage from John Lennon

Some of Elton John's extravagant costumes from his rock 'n' roll heyday -- and a unique gift from John Lennon and Yoko Ono -- are hitting the auction block, and expected to fetch over $100k.

Sir Elton's custom-made gold jumpsuit from his "Goodbye Yellow Brick Road" tour in 1973 is among the showy items up for bid. That alone is expected to go for around $30k. It comes with a sown-in label reading, "Elton John -- 5-22-73."

Another costume expected to get bids in the $20-30k range is the Rocket Man's "Jockey" outfit from a 1980 U.S. tour. It's a Bob Mackie original that was previously displayed at the Venice Biennale and Barney's New York -- so, y'know it's valuable.

There's also a signed photo from Elton to boxing legend Evander Holyfield with handwritten lyrics to "Madman Across the Water."

That all pales in comparison to the standout attraction of GottaHaveRockandRoll.com's Elton auction -- namely a handmade collage that John Lennon and Yoko Ono gifted him for his birthday in 1975.

It's a strange sight to behold -- magazine and newspaper clippings pasted around provocative images and apparent inside jokes, with a headline reading "Who was Mother Goose?" The second piece of the collage includes an Elton John Tour guest pass and a handwritten "happy birthday" note.

It comes with a letter of authenticity from Elton himself, confirming he received it from the iconic couple on his bday, March 25, 1975.

The auction house estimates the collage to haul in $40-60k. All the items are up for bid online beginning July 17.