6 theme calls to theme_asset_icon() in Asset 5.2

asset_icon_ajax in ./asset.module

theme_asset_directory_browse in ./asset.types.inc

theme_asset_search_wizard_browse in contrib/asset_search/asset_search.module

Theme the search folder to display a browsable list of pseudo-assets

theme_asset_wizard_browse in ./asset_wizard.module

Wizard Step 1: Display the icon list for browsing

theme_asset_wizard_selected in ./asset_wizard.module

theme_asset_wizard_textfield_preview in ./asset_wizard.module