Over the last two years, I've seen several putative variations of DnD spell cards.
My interest in spell cards is quite simple: i've been tinkering with the idea of a card-based Dungeons and Dragons accessory, where all of your game resources are in card form, and can be swapped in and out of a three-panelled sleeved booklet, as you aquire and spend resources.
Those card-based resources would include, treasure, magic items, spells, equipment, relationships, and other trackable items.
In addition to the home-brew spell cards featured by several old and new-school bloggers, Wizards created a card-based accessory for 4th Edition, tied into their AEDU system, by issuing decks of powers cards. I really loathed those cards, for a couple of reasons: one, they lacked artwork; two, the 4E powers themselves were too mechanical; and three, WOTC ignored all the other in-game resources.
On the other hand, Paizo published decks of item and treasure cards, featuring lush illustrations, but the related game mechanics were absent from the cards, as were resources like spells.
One of the things I loved about the ADnD Players Handbook was the inclusion of artwork accompanying the spell descriptions. Case in point is the spell, below, Dancing Lights.
Although uncredited, I believe this spell features a Dave Trampier ilustration. It would be lovely to have the above artwork in color, though the black and white version is perfectly serviceable.
Yes, the spell description is probably sufficiently clear that an accompanying illustration is unnecessarily decadent, but having an illustrated set of resource cards like this would be a dream come true for this old-schooler.