I recently made myself a Rubenking cube with stickers from CubeSmith and after solving most of the cube I got stuck with centers that were not aligned properly. Below are the algorithms I found for aligning the centers and completing my solution.
Note that these algorithms will work for picture cubes.

Case 1: Two centers with 90 [...]

When trying to work on an OLL or PLL algorithm it is often useful to have the inverse of the algorithm so that you can easily setup the situation you want to try. Use the algorithm inverter below to obtain an inverted algorithm.
This inverter uses Superset notation which you can find defined in [...]