UPDATE: Yellow tiles are deployed. Enjoy!
In the coming days, we will turn on yellow team tiles. Yellow team tiles will give a speed boost to both teams. We are going to update all maps that used a checkered strategy to instead use yellow team tiles. We have updated all the built-in texture packs with a yellow team tile. This should just work for most players. However, if you are using a non-standard texture pack, you will need to update your own tiles.png with a yellow team tile or obtain a new file from the author.
We will also be updating the unfortunate-maps map editor with the ability to use yellow tiles. Any downstream forks of the map editor should merge in these changes ASAP. NewCompte has already made some Pull Request to popular forks with the change.