Comment 11 for bug 1588266

Actually it seems the icon code works as expected, just that all the snaps I looked at to check haven't yet updated to the 16-series way of doing it.

The icon for a snap goes in meta/gui/icon.*, in which case it gets picked up automatically:

http snapd:///v2/snaps/http
HTTP/1.1 200 OK
Content-Length: 334
Content-Type: application/json
Date: Thu, 02 Jun 2016 14:22:25 GMT

{
    "result": {
        "description": "",
        "developer": "",
        "icon": "/v2/icons/http/icon",
        "id": "",
        "install-date": "2016-06-02T15:15:14+01:00",
        "installed-size": 0,
        "name": "http",
        "resource": "/v2/snaps/http",
        "revision": 100001,
        "status": "active",
        "summary": "HTTPie in a snap",
        "type": "app",
        "version": "4.6692016091"
    },
    "status": "OK",
    "status-code": 200,
    "type": "sync"
}

(that one is sideloaded, because the one in the store has it in the wrong place still).