Bplace changed colors recently but the template functionality doesn't properly map colors from the old ones to new ones, so old templates are kinda fucked. Use this utility to convert your templates to the new palette. Supports *.bplace files and PNG images.
Here you can find Bplace palette files for your favorite art programs. How to use those is beyond the scope of this page, you can just look that up on Google or ask someone.
You'll need a browser extension like Tampermonkey for those to work. After you've installed the extension, just click the userscript link to install it.
You'll need a browser extension like Stylus for those to work. After you've installed the extension, just click the userstyle link to install it.