Charlie Greenberg is an author, musician and all-round creative fellow. Charlie has recently been trying his hand with Zen Brush – a interesting Japanese brush painting app from PSOFT – and GarageBand, combining the results of each app into one pleasing video.

It's good to see this trend of combining the output of several iPad apps into one creative piece. There are still significant gaps in the process that can often only be filled by reverting back to a Mac or PC, but those gaps are likely to shrink significantly as Apple beef-up iOS and introduce its iCloud service later in the year.

On a related note, the developer of Zen Brush, based in the Japanese city of Sendai, is offering iPad owners a chance to support those effected by the recent earthquake through their Zen Brush Art Book app. It's well worth a look.

App Store Links: Zen Brush, Zen Brush Art Book, GarageBand