you can. you have to download the Picture This app from Get It Now. Then, go to the Picture This website and create an account. once you do that, you will have an email address on your account; it will be
[email protected] (whatever you choose as your username). once you do that, then you can send pics to that email address, log on from your phone, check your inbox, and the pics will be there. you can save them and then set them as wallpaper. HOWEVER, what i've found after trial and error, is that you have to send the pics as attachments from another email account (i.e., i use outlook express from my PC) to your Picture This email. otherwise it won't work if you try to send the pics from the website.
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