Detroit Muscle wrote:
Ever considered making an entry for the IEEE micro mouse competition? They make very good senior design projects:

Somehow I feel making a C# framework wont look very good on a resume, and be very boring.

I have to agree with "Detroit Muscle", building a Micromouse would be a great project.

Here is one of the micromice I have designed:

(click for full size picture)

Robotics is great, but might seem a bit challenging if you are not an EE student.
You might also want to get a kit to focus on the software side of things.