I don't believe I would be as successful but if I had to pick one color it would be green pumpkin black grape. Although I could survive on green pumpkin.

You didn't ask for me to choose one color, you asked would I be as successful, lol. So, hmmm. I will go against the grain and say that I just might. Way back when (30-40 yrs ago), I used to throw a black worm and that's it and I caught more fish then!
 If I had to choose now, it would either be black or watermelon red, which seems to be not far off the popular answer of green pumpkin. But then again, I have often wondered about this very question... should I just throw a black worm!

Junebug followed by Junebug.

I could probably do OK limiting myself to green pumpkin.  That's my confidence plastic color for all conditions.  There's one big 'but', though.   The major exception is jig trailers.  My confidence will take a big hit until I can adjust to the loss of my beloved black and blue.

Green Pumpkin with Black Flake

The bait monkey is ashamed to even know you, OP.  

Slightly off topic, but how the hell did the "green pumpkin" color aquire that name?  I know there are all sorts of green gourds, but "pumpkin" is so linked to a orange color, and I cannot detect any really orange in any "green pumpkin" plastics I have handled. 

I fish green pumpkin 80% of the time, so I'd expect to have roughly 80% the success.

Green Pumpkin, even though I fish Watermelon more often. 

Junebug works for me year round.

Watermelon Red flake, has worked everywhere for me. A close second would be Kalins Ron's Craw which works better then water red, but is their color so nobody else has baits like it. Water red is universal.

Green Pumkin

I don't know how they came up with the name but the actual color was made by mistake by Zoom.

 

Allen

 

Watermelon blue flake. Easy choice for me. There are colors that work better at times but this is my favorite. It is my goto tube color for craw imitations, on a grub or Swimbait it's a bluegill. Those 2 presentations are all I need here.

I wish kalins lunker grubs came in this color too btw! They have a "blue gill" color but it's flashy and bright. Watermelon blue is simple and effective for me. 

green pumpkin or black and blue

June bug but I would have to fish my large mouth waters mostly. Wait I can't do that I live near Lake Erie and can't give up smallies.  Anything goby colored it is.  I'll make it work for largies.

Black

Watermelon creme or green pumpkin. I could get by just fine with either of those two. 

No matter what water clarity I'm in, cover, temperate, etc. I can slay with Junebug anything. 

Watermelon Red Flk

I'm  voting for green pumpkin in this election. You should have seen him in the debate against black/blue, watermelon, Junebug and smoke. He slayed them! Says he's going to put up a net to keep the pan fish off of the bass nest and is going to make them pay for it! Look out! 

Green pumpkin or Purple.   I never catch anything on black!

 

This topic is freaking me out. Because for the past two weeks I'm catching so many fish on a gold lipless crank. So now I can only use gold, or else I can never use gold.

I wouldn't like to fish with only one color, but if I had to I think I could have success using the standard Berkley Blue Fleck. 

Toss up between green pumpkin, watermelon black flake, baby bass or gycb's pearl gold/black flake. 

Amber red gold flake. Don't look for them I purchased them all.