28 hours into fonts this weekend...
I think I'm overdosing...
.... . . . . .

Is there a cure?
The first one might have some Art Nouveau potential,
but it's quite a distance from being of any real value.
The second one isn't highly original, but it does have
a marketable character. Is it based on anything?
The third one looks like you took a generic sans and
tried to make it more like Yellow. I think Yellow is
a great source of inspiration, but it would be much
better to start from scratch.
hhp
hrant, the second isnt really based on anything except perhaps the strange thread of design that started out as German Sans and ended up becoming American Urban.
The original is available here, free for anyone and all purposes except for being sold as a font:
http://www.dafont.com/mob.font
The version in the pic above is a slight refinement of the font. As well as better letter spacing and few small tweaks, I suppose the biggest factor in decided to refine it was the lower case g. I go back and fourth over whether I like the top right hand "corner" of that glyph more square, as it is in version 1.0, or more rounded as I am working on in version 2.0.

I tried using diagonal cuts in a sans like that before. Not sure if I still have it around.... I can't find it.
Anyway, Argon is somewhat related:
http://typophile.com/node/82830
http://www.flickr.com/photos/ohbendy/sets/72157625196184681/
Captured from web.archive.org on 6 Nov 2013. view this capture