There are several synonyms for the phrase 'were striking'. These include 'were remarkable,' 'were noticeable,' 'were impressive,' and 'were outstanding.' All of these synonyms refer to something that is particularly noticeable or stands out from the ordinary. For example, if someone says that the colors in a painting were striking, they mean that the colors were bold and attention-grabbing. Similarly, if a person remarks that someone's performance on stage was remarkable or outstanding, they mean that the performance was impressive and noteworthy. Using synonyms for 'were striking' can help to add variety and color to your language, keeping your speech and writing interesting and engaging.