I have been practising the strumming patterns using the same chord progression for some time now. I play each pattern for a minute and then increase the tempo until I can't play it well any more and then move on to the next pattern. I am now finding that this is very uninspiring. This isn't a fault of the DVD, though, which I think is good with everything explained well.
Yesterday, I bought a chord songbook (The Big Guitar Chord Songbook - The Nineties). I think this will be a good tool for practising the strumming patterns. The idea is that I would pick a song at random from the book, and then use the chord progression from that song to practice the different patterns (even if those patterns are different from the original recording of the song). Some of the songs have chords which I don't know, so I will be learning something else too. I'll be getting 3 for the price of 1 - practising strumming patterns, learning new chords and learning a song as well. I am not sure if this is the best approach or if I should just concentrate on one thing at at time, but I am going to give it a go. Hopefully I will find it more inspiring that what I am doing now. The same approach could be used with different finger picking patterns as well.
BTW - I haven't given up on transcribing songs myself, but I thought buying a songbook would be a good way of boosting my rather meagre repertoire.