New margarita machine rental company needs a fun, intuitively descriptive logo

We are looking for a logo that descriptive enough in it's design so that when people see it, they know that it has something to do with frozen drinks, and delievery of some sort. We really don't have anything particular in mind, but figure that either a tropical or cityscape theme would be a good place to start, but if you have a different idea you want to go with, we are open to that also.

Ritas To Go

Tagline:
*we do not have a tagline as of yet, but are open to new ideas if you have any* A $25 bonus will be given to the creator of a successful tagline.

Accepted File Formats:
Standard Web Formats (.jpg, .gif or .png); Vector Formats (.eps, .pdf or .ai); Layered Formats (.psd or .tiff); all fonts used in the design

We would like the finished artwork to be delivered in the following formats:

-  .psd (layered)

-  .eps (scalable)

-  .jpg (300dpi & 600 dpi)

-  .pdf

-  All fonts used in the artwork should be delivered also