Graphic for Charity Walk Team T-Shirt

My wife is a brain tumor survivor. This October will be her 15th year post treatment and represents a major milestone that most glioma brain tumor patients never get to celebrate. If her MRI scans are clean she will be released from future follow-up and considered cure. Every year, my wife forms a team for the Walk Ahead for a Brain Tumor Cure charity walk. Teams in this walk, typically have signature colored t-shirts with sayings or graphics on them. My wife's team, "Marla's mob" has been no different and I have come up with graphics to make different t-shirts playing off the mobster theme (see attached). Once again, "Marla's Mob" will be out again this year. Since this is a big year for her, I'd like to come up with a special t-shirt design. I am a bioengineer with little design talent, so I am seeking someone who can help me come up with a graphic to put on this year's team t-shirt. I do have an idea, but I am open to those who inevitably have more creativity than I do. Since this year is about her being close to meeting the 15 year milestone, I'd like the graphic to be more upbeat and positive. My original idea was an image of her walking on a curvy road with mountains in background (long, difficult journey) and getting read to pass a marker or banner with "15 years" on it. It sounds lame, but it's about all I have at the moment. Here are the requirements: - there is room for graphics on the front and back of the t-shirt. We've typically had images on both sides - I need to own full copyright to be able to get these printed. So the logo cannot contain images owned by others. - The graphic needs to be delivered in vector graphic format so I can get it printed and resized without issues (a few file formats would be helpful to assure the printer, [login to view URL], can use it) - it should be a maximum of 2 colors to keep cost down on printing - I need the final design by Sept. 27th