One photo shows a beer can that Emery said was taken out of a trash can in Clemens' New York apartment in 2001. Emery said the beer can contained needles used to inject Clemens. That picture also shows what Emery said was gauze used to wipe blood off Clemens after a shot.
The other photo shows vials of what Emery said were testosterone and unused needles, items the attorney said Clemens gave to McNamee.
While Clemens' camp called it "manufactured" evidence, Emery said the items were "just a collection of stuff" thrown in a box and "kept in a basement for seven years."
Emery said McNamee kept the items because he "had this inkling and gut feeling that he couldn't trust Roger and better keep something to protect himself in the future."
Clemens met Thursday with committee chairman Henry Waxman and ranking Republican Tom Davis for about 20 minutes, then signed an autograph for a bystander upon exiting. That was one of many times Clemens was asked to stop to affix his name to something or pose for a snapshot.
Clemens' deposition Tuesday was the first time he addressed McNamee's allegations under oath, and therefore the first time he put himself at legal risk if he were to make false statements.
Thursday's bizarre events served as something of a dress rehearsal for Wednesday's session, which will be held in the same wood-paneled hearing room that housed the committee's 2005 hearing with Mark McGwire and Rafael Palmeiro.
That hearing was part of Congress' push to get baseball to toughen its drug program, increasing tests and penalties. It also led to former Senate majority leader George Mitchell's report on doping in baseball.
The 45-year-old Clemens, who pitched for the Yankees last season, requested Thursday's meetings with the committee members. He carried a white three-ring binder as he headed from one House office building to another, going through a garage and taking a freight elevator at one point.
"Because the perception out there was so strong originally that he did it and was lying, he's going to extra steps to try and persuade and make people comfortable with the fact that he didn't do it. He's having to take extraordinary measures because the allegations are extraordinary," Hardin said.
Hardin said Clemens was meeting with individual representatives "to assure them privately the same thing he's saying publicly -- that he didn't take steroids, and he didn't take human growth hormone, and he's here to talk to anybody about it who wants to." Information from The Associated Press was used in this report.