Place theme.p3t file in X:/PSP/THEME/ folder and select theme from XMB->Settings->Themes
X is your psp USB or PSP media card
Or Download Only theme file directly from your PSP internet browser.
Description:
A new theme for the Sony PSP (firmware 3.71 and above) that has official (slightly edited for size) icons. This is the only Mac theme designed for the PSP that has anti-aliased edges, which means that the edges are smooth, and look great on the PSP. (note the preview image is not actually the PSP. I made this image on the PSP, but it really looks just like it does on the PSP). (this is a .ptf (psp theme file) file. Put in the themes folder of your PSP Memory Stick)
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.ptft/sectionid_0_entryid_0.32bit.png)
Mac OSx Tiger (v1.0) 
Mac OS X Leopard
white icons.png)
