The site is well-indexed, includes links to a community blog and a forum, there are both traditional front and back views and "top downs" (which I've shown above). You simply locate the ones that are of interest to you, download them to your computer, use an art program like "Paint" or "Printshop" to re-color them if you wish, scale them to desired size, and then print them out. You can even do black and white and hand color them if you wish.
I frequently use the top-downs, appropriately colored, to play test new rules and test modifications to existing rules and such. From their main menu at the left, either select "Paper Soldiers" or select the specific time period of interest. You can find wonderful renditions of sailing ships and galleys, figures from Ancients through the Renaissance, 18th century, 19th century and moderns (even some Sci-Fi), just about anything you could want. And, with a little practice, you can usually modify what you find and change uniform colors, formations, flags, etc. And speaking of flags, this is also a pretty good reference for some wargaming flags, as they have flags from both sides at Luetzen, French of the Grand Alliance era and of the Marlburian era and the SYW, and just about any other combatants you could wish for. Here are some "traditional" straight-up samples of some Williamite Cavalry from the Grand Alliance section:
All-in-all, not a bad way to experiment with a set of rules, explore a new period, entertain a young one, or just build yourself a little collection of them! They really are a part of wargaming history. And, if you print these out in black and white and hand color them with some water color washes, they will stand proudly in any collection. By the way, printing them in black and white and turning the youngsters loose with some water color markers can be fun as well!
Oh, and another By The Way, they do offer Ottomans and even my beloved Polish Winged Hussars. So, simply select a few stands of Austrians, Germans, French (recolor if required), zip off a few Poles and Turks, and there you go - St. Gotthard in 1664 or Vienna in 1683, all for about one good afternoon's work.