I am going to be making and decorating some cupcakes this week and they do not really care what they look like so I thought I would try to do some that look tie dyed. Would I just do the bag striping with multiple colors to get this look? I've never tried it but I am looking forward to seeing the results.

Do you mean like this?
http://www.chicaandjo.com/wp-content/uploads/2009/06/fourth_of_july_collars_1.jpg


Bluehue.

I stripe my bag with gel colors. Use a small amount of icing because you will need to switch off bags to keep the colors vibrant.

When I did these I just lobbed different colors of icing into a large pastry bag and piped away...HTH
(Hope the pics attached)

Guess they didn't...let's try this again...

mysweetconfetions- LOVE that blue and lime!! Beautiful!

I like to make tie dyed icing by adding spoonfuls of different icing colors in the bag- not really striping it per sey that was one color ends and the next one gradually starts- if I want the color to vary a lot- I just alternate several spoonfuls- like spoonful of yellow, spoonful of blue... green, purple, yellow, blue, green, yellow etc-- I fill the bag by cuffing a bag over a cup and just dropping the spoonfuls in- when I squeeze out the icing the colors are more random that way.
This is a long explanation for a simple process- sorry about that- I'm a visual learner- so I gotta explain it like I see it in my head.