If you open up HTC Home Customizer...you'll see a folder called FILES
In this folder...there's another folder called ICONS
Place your NEW Icons in its OWN folder, Name the Folder and then put it in the ICONS folder.
Now use HTC Home Customizer to select your new icon set.
The same procedure goes for Background, Clock & Weather
D W N Y
Nexus 5 * KANGAKAT 4.4.2 v3.0 * Franko.Kernel r20 * TWRP
T-Mobile * Galaxy Note 3 * DarthStalker 4.3 v4 * TWRP
Nexus 7 3G 32gb 2012 * Factory * Rooted * Franco.Kernel r52 * TWRP
Retired: HTC One, Nexus 4, GNote2, One S, Sensation, GS2white, Sensation, G2, HD2, TP2, FUZE, TILT, BlackJack, MDA
Retired TABs: HTC 4G Flyer 32gb, Toshiba Thrive, HTC WiFi Flyer, LG G-Slate, Samsung TAB