There are plenty of ways that you can create flickr apps, either by directly working with rest or soap responses or using some api. API has some choices , like you either want to do it by method call API or by query alike LINQ API.
Few months ago i have created a LINQ.Flickr (www.codeplex.com/linqflickr), that gives you some options to start with
Like the simple query can get photos for a partiular user , with your specified size.
var query = from ph in context.Photos
where ph.ViewMode == ViewMode.Public&& ph.User == "##YourUserName##" && ph.PhotoSize == PhotoSize.Original
orderby PhotoOrder.Date_Posted descending
select ph ;
or you can even specify , how many photos you want.
var query = ( from ph in context.Photos
where ph.ViewMode == mode && ph.User == "##YourUserName##" && ph.PhotoSize == PhotoSize.Original
orderby PhotoOrder.Date_Posted descending
select ph ).Take( 10 ).Skip( 0 );
If that looks fun to you, then go ahead :-) and let me how else can i enhance it.
Thanks,
Mehfuz Hossain