If you’re looking for a way to customize your computer keyboard, check out HolyOOPS. Based in China, HolyOOPS makes CNC-machined keycaps out of aluminum or titanium. They feature symbols or characters from anime, comics and at least one TV series. Which is probably why they’re a bit low key.
According to the group-buying service Massdrop, which posted all but one of the images below, HolyOOPS’ keycaps are compatible with Cherry MX switches.
HolyOOPS has a Taobao shop where it sells its aluminum keycaps for between ¥160 (~$26 USD) to ¥259 (~$42 USD) each and its titanium keycaps for ¥300 (~$49 USD) each. However, I don’t know if HolyOOPS accepts international orders or how much it’ll set you back for the already pricey accessories. Thankfully as of this writing you can sign up with Massdrop to get the aluminum keycaps for about $28 each. GeekKeys also has the fist and the Bleach mask design for $30 each. HolyOOPS has also posted group buys on Geekhack a few times.