The Wall of Originals

Close-up.

The Wall of Originals (aka The Wailing Wall, because so much fail is contained in one concentrated area that it causes one to wail in tears) is a large sheet of Christian's customized Pokémon cards. It hangs from one of the walls in Christian's room. The lighting in several of Christian's videos suggests that the sheet is covering a window.

Things of Note

There are several interesting trends which emerge when one takes in all of Chris's cards. They provide some insight into Chris's game design process, none of them particularly surprising.

Every single card requires a coin flip. Or two. Or three. Every single one. Okay, not every single one, but several cards have multiple abilities, each of which requires a coin flip, which averages out. (To be fair, the same is true of actual, official cards.)
The earlier cards that depict Christian depict him as a disgusting mutant (fairly accurate) with a wide, flat nose and thick lips (not so accurate). This eventually branches out to include terrifying photoshops where an expressionless Chris is jammed into crude(r-than-normal) MSPaint backdrops.
Note the first appearance of a female alternative for Pikachu, tastefully dubbed Chicachu, who can only deal damage when accompanied by a boyfriend. Which isn't sexist in the slightest!
Plautistic. It's a Grass/Psychic Pokémon. At the time Plautistic was made, the Pokemon TCG only allowed each Pokémon to have a single type. Later on, though, there would be multiple cards depicting the same Pokemon with different types, and, eventually, singular Pokémon with two types. It is autistic. It is extraordinarily likely Chris seems to think autism and psychic powers are linked. This will become a recurring theme.
Chris shows up as a trainer, a gym leader, and a Pokémon, in several varieties apiece. Again, totally in line with his later storytelling technique of "gain as many powers as I want or need to do whatever it is I want or need to do." He has himself as a "normal" type, and is described as an autistic Pokémon, reinforcing the conclusion that he considers autism practically a superpower.
In fact, many cards have devastatingly synergistic effects or several complimentary effects at once, allowing Chris to pull off combos with only one or two cards. According to reports about his card game technique, Chris would need these hugely layered card effects because he can't deck-build worth a damn.