concrete5's built in avatar editor has an almost unknown feature. The ability to put rounded corners on avatars!

First copy /concrete/single_pages/profile/avatar.php or if you upgraded your site /updates/concrete5.x.x.x/concrete/single_pages/profile/avatar.php to /single_pages/profile/

open the file and search for var flashvars there should be a code block similar to:

var flashvars = {
    width: '<?=AVATAR_WIDTH?>',
    height: '<?=AVATAR_HEIGHT?>',
    image: '<?=$av->getImagePath($ui)?>',
    save: "<?=$this->url($c->getCollectionPath(), 'save_thumb')?>"
};

now all we have to do is add a parameter. first we have to add a comma after ...'save_thumb')?>"

save: "<?=$this->url($c->getCollectionPath(), 'save_thumb')?>",

then under that we can add:

rounding: 12

so it looks like

var flashvars = {
    width: '<?=AVATAR_WIDTH?>',
    height: '<?=AVATAR_HEIGHT?>',
    image: '<?=$av->getImagePath($ui)?>',
    save: "<?=$this->url($c->getCollectionPath(), 'save_thumb')?>",
    rounding: 12
};

and that gives a slight rounded corner like here on concrete5.org. you can change the number to almost anything you want, for example 100 is a circle.