Hacking together bits of mastodon.el to load @Gargron's toots with media

finding-gargron.el

(defun lookup-user (user)
  (let* ((json (mastodon-http--get-json
                (mastodon-http--api (concat "search?q="
                                            user))))
       (accounts (cdr(assoc 'accounts json)))
       (acct (mapcar (lambda(account) (cdr (assoc 'acct account)))
                     accounts))
       (ids (mapcar (lambda(account) (cdr (assoc 'id account)))
                     accounts)))
    (cl-mapcar (lambda(a b) (list a b)) acct ids)))

(defun user-media-timelines-init (id)
  (mastodon-tl--init "media"
                     (concat "accounts/" id "/statuses?only_media=true")
                     'mastodon-tl--timeline))

(defun user-media-timelines (username)
    (user-media-timelines-init (cadar (lookup-user username))))

;; set mastodon-instance-url to your instance
(let ((mastodon-instance-url "https://cybre.space"))
    (user-media-timelines "gargron@mastodon.social"))