Step 5: End Result
You should end up with five bottles of relatively clear liquid. The purple will probably stay pretty opaque. The red, orange, and yellow will be pretty see-through. Green will most likely be in-between the two extremes.
There were some commenters who noticed problems with long-term storage of the purple variety -- they reported that over a period of days the purple color broke into a red with some blue mixed in. We didn't store our finished product for more than a day, so we can't speak to their experience, however, we don't think it's all that strange a result. The purple bottle was much cloudier than the others and we're sure they had to mix red and blue dyes to get that color to happen in the first place. You may want to drink this bottle quickly, rather than storing it long-term. (We liked the purple flavor a lot, so we didn't have any left after our tasting.)
So, how does it taste? We found that we liked the green flavor best of the lot -- it was probably the closest to the original skittle flavor and it mixed well with the vodka. Purple was a definite runner-up in the flavor contest. We didn't have any of these two bottles left after our tasting party.
Red tasted like cough syrup, which is pretty reasonable since it's a cherry + alcohol mix. Not our favorite, but if you like cough syrup taste, this is your winner.
Orange and yellow were definitely pleasant, without the cough syrup taste of the red.