Hold everything you're doing: a FLAMING HORSE MOD has been released for Skyrim. Because, you know, the only thing better than a horse is a horse on fire -- wait, that came out wrong.
"Blaze of Eventide", as it is named, lets you summon said horse, is persistent with the world, and compatible with related mods.
To summon the majestical fiery creature, you'll have to nab some books inside Drelas' Cottage ("a small cabin located northwest of Whiterun, west of Hamvir's Rest, south of Morthal, in the vale between the mountains") -- after that you can set your horse to explode on command and damage enemies. The big guy is immune to fire damage -- in fact, hitting him with fire spells will heal him.
Hit the source to install the mod via Steam Workshop.