For Sony Ericsson
Theme Creator Pro (discontinued)
QUOTE
T68, T68i, T68ie, T226, T230, T238, T300, T302, T306, T310, T312, T316, T610, T616, T618, T630, T628, Z600, Z608


Sony Ericsson Themes Creator (PC, MAC & Linux)

Skin Studio for Tracker 3
P800

Vito P900 ThemeEditor
P900


For Nokia
Carbide UI 3.2


For Siemens
Siemens Series 65 Theme Creator


For Windows Smartphone
Ruttensoft's Home Screen Designer 1.3.2



You will also need an image editor such as
Adobe Photoshop or Paint Shop Pro or GIMP (freeware)