I'm not a fantastic jungler, so take this with a grain of salt.
Having no runes just restricts your jungle experience to the best junglers. A lot more champions are viable as junglers since its recent patch, but if you just stick with the best ones, you're fine. The fact of the matter is that tricking out a super-awesome jungler summoner is going to have a bit of an opportunity cost when you get out of the jungle, since jungles are all about armor and sustain, and ganks are mostly about targeting AP champs and burst. I prefer to play my warwick, jarvan, and udyr as junglers, and I've been toying around with jungling as skarner. Other easy jungles are nocturne, fiddlesticks, and amumu.
Don't bother with Shaco if you're worried about your summoner setup; jungling with him is all about preparation and ritual. Another thing I saw recently was jungle shen, which is a huge mistake: he can jungle just as many camps as anyone else before he needs to go home, but they take 3 times as long to kill. Don't mistake "winning" the jungle with being a good jungler.
For simple autoattackers (ww, jarv, udyr, noc), the strat is easy: Cloth armor and 3 health potions, wolves, smite on wraiths, minigolems, back for a sword, repeat, back for a razor, and then you can go for blue, rake across the jungle, upgrade to wriggle's and then start on boots. Waiting that long to go for your buffs is a pain, but you can probably do it with no runes/masts at all, and you'll catch up to mid on XP quickly once you start exploiting the vs. minions proc and don't try to force any but the easiest ganks with your measly wriggles + basic boots. You should try to put in a gank or two starting around level 6 if (and only if) your champ can totally lock someone down with CC (e.g. warwick and jarvan) since you won't have any real damage yet. You might pick up some kills, or you might make them burn flash; either way if you have a strong gank ult you should put it to good use if it'll cool down anyway before you need it again. The main idea here is to farm boatloads of monsters in a hassle-free environment spamming the crap out of razor procs. By the time the lane phase ends, you'll be ready for serious team fights.
This will get you a ton of rage from a select few players who fancy themselves gods of the gank, and you'll just have to ignore them. Yes, junglers get blamed for everything. Even worse, IMO, is when your team essentially loses the game before you were ready to do anything. But as long as you make yourself available to cover lanes when someone needs to B and keep your eye out for really easy ganks, your team will usually manage to do at least as well as if you 2-manned top lane. If people blaming you for things that aren't your fault is a problem, you shouldn't be playing league of legends.
My general philosophy is to just get whatever character the team needs, and if that coincides roughly with strong jungling, and we don't have a jungler already, I'll go for that; otherwise, don't worry about it. Jungling is not nearly as mandatory in my experience as most pros make it out to be; Just this week I've 2v1d top and blown up the turret before 10 minutes. Twice. Both times my team took excellent advantage of that early XP and gold bonus. Most people only think the jungle is mandatory because they're not willing to take the risks necessary for a push/starve 2v1 to pay off, which is ironic since these people tend to gamble on killing opponents of equal rating.
edit: LOL @ viktor video, the guy in charge is so awful at... talking. I had to give up halfway through the second ability because I god tired of listening to him stutter and suddenly remember important things.
