As with the other carts there isn't much value in any pirate cart of any kind. Mass produced and cheap they can go as high as "1,000,000 in 1" in numbering but actually only have a handful of games on them, the rest variations of some kind. Our colleagues over at NintendoAge for example list over 50 pirate cart variations on their site alone. Looking around on the net you can find references and pics of dozens more in all colors and shapes. Even the 31 in 1 mentioned before comes in full NES cart size as well.
Pick a color, shape and number combination and I'm sure it was made at some time.