*Assuming your iPhone is fully jailbroken.*
Download openssh from cydia for your phone.
Download Cyberduck for mac.
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Go to
http://suavehd.xengi.org/ and scroll to bottom to download Suave HD Theme and Icons
(Make sure to open with stuffit expander as it saves as a .theme file)
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SSH into your iPhone (simple enough to do look on the Youtube videos it takes literally seconds)
Once its linked go to the 1st menu on the scroll down bar in Cyberduck which shows a "/" and then click on Library and simply drag the 'Suave HD.theme. file into the themes folder and let it transfer.
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Then just go into Winterboard and check Suave HD.
...Simples ;-)
Lawler
BTW I am really impressed with this theme; the HD is so crisp....just need to find a good lockscreen that matches it :-/