Great idea about the pictures and labeling! Many times, a species can be hard to identify because they look almost identical to another species (this also comes into play with different forms of the same species, and with hybrids). Sometimes, the only 'sure-fire' positive way for identification, can be based upon the plant's flower.

A lot of the tillandsia ionantha flowers look almost alike, unless they're yellow-white in the Druids.

Another thing I did when taking the pictures is place a ruler right near the plant so it would be in the picture, to remind me what size the plant was when I got it. Since then many of the plants (mostly the ionanthas) have flowered and are pupping like mad, though some others have thrown out flowers, too, and are pupping. The filifolia flowering was a surprise (it's pupping, too), and another odd, dried-up tilly I rescued and soaked a lot also eventually flowered unexpectedly. They are all fun plants that don't take up much room and don't seem to mind my usually very dry climate. I like their unusual shapes and sizes and haven't ever acquired one for its flower; to me, the flower is just a bonus :)

Every species I have tagged with an aluminium label that lasts for centuries, I used plastic but to my horror they went brittle and faded. I also have a stock list of my collection and next I am endeavouring to photograph each Tillandsia as it flowers. So im pretty well labelled but my collection (its pretty vast) does have a few unamed plants that I would love to get named.