Ok Endo, you inspired me to give it a shot. Here is a Captain of Rohan I created using the Equite of the Sacred Shroud as the base unit. It took me about 30 minutes to make the unit because I am terribly slow and art is not my thing at all. But for a first attempt, I am really pleased with the results.
Very good! Congrats for getting started. It takes time, but the results are usually quite good when you have a good sprite or several which you use for reference. Copypasting and color-changing usually gives me the best results. You can get pretty fancy units if you remove the horse of a mounted unit, take sprite of a glamourous/ethereal unit and don't give it either, remove and/or add cape, wings, shield or mount. My avatar is a Horse Brother without a horse, my Warlord from Ulm Upgrade is LA Ulm Zweihänder with Black Lord's cape, Wyvern and DomII Daoine Sidhe (Van dressed in green) make a good Wyvern Knight, etc.