Changes in Meaning with the Spanish verbs SER and ESTAR
estar abierto - to be open
ser abierto - to be frank/open
estar aburrido - to be bored
ser aburrido - to be boring
estar afectado - to be affected/bothered by sth
ser afectado - affected/stilted
estar atento - to pay attention
ser atento - to be attentive
estar bajo - to be located way down or to be depressed
ser bajo - to be short (in height)
estar bueno - to be in good health, to be fine, to taste good, to be hot
ser bueno - to be good, honest; to be a good person
estar listo - to be ready
ser listo - to be intelligent
estar seguro - to be sure
ser seguro - to be confident
estar frío - to be physically cold
ser frío - to be a cold person
estar gordo - getting fat/out of shape
estar grave - to be in bad health
ser grave - to be serious
estar interesado - to be interested in sth
ser interesado - to be interested in sth for material reasons
estar loco - to be acting crazy
estar malo - to be ill/to taste bad
ser malo - to be a bad person/thing
estar molesto - to be upset/annoyed by sth
ser molesto - to be irritating
estar muerto - to be dead
ser muerto - to be boring
estar negro - to be furious
estar nervioso - to feel nervous
ser nervioso - to be a nervous person
estar verde - to be unripe
estar viejo - to be getting/looking old
-These are just a few example - send me more good ones!