Anyway, using a paintbrush with the blocks is faster then using the pencils.
I also tried a textile medium (got so involved with that and forgot to take photos). In any case, the textile medium works well to prevent colour bleed. You just need to take your time. Refer to Carla Barrett's Inktense Fabric Paint Tutorial. It's a good reference.
|Using the Blocks with a paintbrush|
|Colours of the rainbow (all the blocks in the box)|
|I wet the cotton and used an Inktense pencil|