Making a tumblr theme is not that easy. But there are sites that offers good quality themes, with affordable prices.
It's easy to customize your blog's theme on the Tumblr app for Android. Just go to your blog page and click Edit at the top. From there you can change your theme and customize its colors and fonts
Google "perry the platypus tumblr theme".
Learn HTML.
The best thing to do is to message the user on Tumblr and ask where they found their theme or who made it.
The theme used on that site is called Optica
Search around the theme garden. There should be one there. If not look around the web. There are lots of sites dedicated to tumblr themes.
yes
You simply start posting things about a specific subject, fandom, or "theme".
things change. there are probably plugins for the old theme
That url shows up as not found.
you just look on the tumblr website in the theme section. if you dont find anything you like, you can google 'tumblr themes' and search for what your looking for and just get the code. Then you just have to paste it into the custion HTML section.