My original answer was for the menu, see below.
- css -. , href-tag css, :
a[href*="yourview"]{
display: block;
padding: 0 0 0 20px;
background: transparent url(link/to/img.png) 0 0 no-repeat;
}
, /layouts/joomla/sidebars/submenu.php html/layouts/joomla/sidebars/submenu.php , , . .
: , /administrator/components/com _componentname/componentname.xml, :
<administration>
<menu img="link/to/icon.png" >COM_COMPONENTNAME</menu>
<submenu>
<menu link="option=com_componentname&view=aview" view="aview"
img="link/to/other-icon.png" alt="Componentname/Aview">
COM_COMPONENTNAME_TITLE_AVIEW
</menu>
</submenu>
</administration>
( , ), css backend , . , isis-, joomla.