copyright will kill me

Can't believe after all these years I'm still hung-up on copyright.  I know everyone is doing it....For 30 years...especially the past 15 (public school librarian):  I jammed "copyright" down throats of staff and students.  Now........I see all these images online and on greeting cards  and I want to make quilts from them (knowing my art teacher once did art for greeting cards) I can't in my heart of hearts.  How can I take an image from the internet and create a quilt and hang it at "Houston International Quilt Festival" and not get caught...I see copyright infringement everywhere.  Why can''t I  cheat tooooo???
Ugh!

so why isn't this block copyright infringement?  Public Image? FairUse?