Making a signiture

[DragonRider]

Hi guys and girls and thanks for looking.

My son and myself and possibley the wife are getting into 4WD buggies.

We have decided on a Team Name for ourselves but having difficulty making the signiture/pics that some of you have.

Is there a piece of software that I can use to help design and make the signiture which will then in turn be produced onto T-shirts and Hoodies.

Thanks in advance for any help and advice.

Cheers

Mark, Jodie & Wez