/*Insert these into your ST theme, or CSS override userscript for some jolly imagery!*/
/*I made one for each image shape ST supports by default, if your theme uses a custom size/shape you might have to adjust.*/
/*RECTANGLE*/
.mes .avatar::after{
content: url("https://files.catbox.moe/mn4rae.png");
transform: translate(5%,-5%) scale(20%);
position:absolute;
} 
/*CIRCLE*/
.mes .avatar::after{
content: url("https://files.catbox.moe/mn4rae.png");
transform: translate(-52%,-48%) scale(10%);
position:absolute;
}
/*ROUNDED*/
.mes .avatar::after{
content: url("https://files.catbox.moe/mn4rae.png");
transform: translate(-50%,-48%) scale(10%);
position:absolute;
}
/*SQUARE*/
.mes .avatar::after{
content: url("https://files.catbox.moe/mn4rae.png");
transform: translate(-50%,-48%) scale(15%);
position:absolute;
}