I have seen a quite a lot of plaques on my travels around London, but apart from the few below I haven’t tried to photograph many of them. Plenty of other people have though: there are 250,000 photos on Google Images, as well as websites dedicated to the subject. There is a good selection of photos here. There is also book on the subject: Blue Plaques and the Stories behind Them. Blogger Londonist has a useful map and links here.
There are plaques in other colours, and there are other schemes, some initiated by London boroughs, and these record events as well as people. It’s no surprise that over the years the plaques have attracted the attention of artists and my own modest collection below includes one interesting anonymous plaque in Shoreditch
A wonderful off-chance that these two musicians should be remembered side-by-side. Nos 23-25 Brook Street, Mayfair. On the right G F Handel, composer, 1685-1759. On the left Jimi Hendrix, guitarist, 1942-1970Old Street