Many popups, now and planned, support theming to adjust their display. Below is the Icons Popup shown in various themes.

In addition to the default list of themes provided with LastTab, user themes can be used as well. Once LastTab is installed it creates a folder named "lasttab" in your profile folder, and a folder named "popups-themes" underneath it for additional user themes. To use the new themes simply go to the LastTab options dialog.

Color themes are XML files. To get started with your own themes use the existing themes as a base. Color codes are represented in the familiar RGBA syntax (red, green, blue, alpha). Additionally, themable popups are SVG documents. The following .svg file can be used to get a better visual of a popup for designing. Inkscape can be used as an SVG editor.