I don't want this to turn into a 'go forth and rant about why I hate <insert controversial mud here>' topic but... I never saw any sort of cohesive atmosphere on aardwolf. Iirc you can fight a slice of watermelon somewhere, and go into some weird outer space thing... it's just silly. But... whatever.
Muds are pretty much all accessible, I don't think I've ever seen a mud that uses 100% graphics, to the point where it's unplayable. You might get stuff where you can't entirely remove the prompt or something silly like that, but as far as I know, the most you'll get with graphics on muds is ascii descriptions, and you'll generally get a text one, too. There are graphical muds, but I've always felt that those are separate enough from mu*s to be some sort of far removed subcategory.
As for new muds... Could you be a bit more specific? What exactly is it that you're looking for in a mud? Pvp? Stock diku hackNslash? RP? Crafting? There are muds (multi-user dungeons) and then there are sort of... branches of that, like mush (multi-user shared hallucination... or something like that) and muc, which stands for something I can't recall right now. Those are more rp oriented, and I think I could suggest a few if that's what you're in to. Before the dawn (contemporary setting, draws inspiration from stuff like Dresden, and some other stuff, Dresden is the only one I'm familiar with), burning post 2 (inquisition, with actual mages and demons and all the related baggage that it implies. It's very realistic and very entertaining. You can even be a bard and wander around telling crazy stories, or a chimerest, scientist, and annoy the religious masses by ranting about geometry and how you've just come up with this innovative new concept called radians... and hope you don't get burned as a heretic...). It's very hard to suggest rp intensive stuff like this because it depends on what you're interested. I could give you a diverse list and still miss what kind of setting you like to rp in completely.
As for muds, lost souls is really great if you're willing to take the time to learn. Fair warning though, you will die a lot before you start doing things right, and I don't think anyone has ever successfully played their first character -- I got myself blown up by enough displeased deities enough times that the amount of gold required to fix me was just unreasonable. I've played aethar which is a lot more generic but not bad for its genericness, seventh plane (lots of skill/spell grinding, especially as a mage), empire mud (now in beta, very unique, with lots of building, crafting, city management, and balanced pvp and mob slaying), four dimensions (very awesome puzzles, great descriptions, some really unique stuff, like driving around vehicles, or charging around in the primeval forests of post-history wielding a laser rifle... and, did I mention, the puzzles/quest/writing are all very amazing)... ponders... end of time (somewhat FF oriented, but everything is well documented, so it's not intrusive if you don't know anything about Squaresoft), yugioh (cool game, but I wish more work would get done on it *nudge*hopefullythedeveloperisreadingthis*nudge*). Those are all the ones I can think of that grabbed my interest meaningfully, but I could probably look through this giant folder and scrounge up a couple others.
Sorry for the rambling post, and I hope you find a mud that you enjoy! (Mud connector has great filters for finding muds, and top mud sites too, although they have lots and lots of dead muds, so I usually use TMC if there's something not-so-specific that I'm looking for.)
Go, balloons. I don't see anything happening. Go, balloons. Go, balloons. Go, balloons. Stand by, confetti. Keep coming, balloons. More balloons. Bring them. Balloons, balloons, balloons! More balloons. Tons of them. Bring them down. Let them all come. No confetti. No confetti yet. No confetti. All right. Go, balloons.