I have my service integrated with google voice and I wouldn't have it any other way. I'm almost positive you can forward texts using google voice, along with phone # blocking and text to email services. I would seriously look into this (free) service for exactly what you're looking to do. Seriously. With this service, I'm able to text people from my laptop or other people's phones and leave my phone at home.
To save a picture that was texted to you, just go to the conversation thread, (where you can see your texts and the responses from your contact) click and hold on the thumbnail and an option screen will pop-up with an option to save the picture to your gallary.
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