doubt 'coloured texts in Emails' -reg

dear friends,
well my doubt.pls guide me.

that, i m getting mails frm a lot,including rediffmails promos,like fun/colour,image filld letters with design. some having attachments(but i think,these attachment contain the designs).
bt still,i want to knw,hw can also send one like tht?

i m n need to send a low in size invitation to someones mail.whn he opens,then he might to see my broucher.

csn any one guide me pls?

thanks in advanc4

wt lov
shinu